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Djokovic beat Griekspoor, ranked 39th in the world, 6-2 6-3 on Wednesday to move into the quarter-finals.

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US Open 2021: Novak Djokovic shifts up a gear and shrugs off heckler in disposing of Tallon Griekspoor - Eurosport

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US Open 2021: Novak Djokovic shifts up a gear and shrugs off heckler in disposing of Tallon Griekspoor - Eurosport